* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: monospace, monospace;
}

body {
    background-color: orange;
}

.outer {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    margin: 10px auto;
}

#holder {
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    margin: 0 auto;
}

#new-row {
    border-radius: 0;
    border: solid 4px black;
    margin: 0 auto;
    padding: 4px;
    font-size: 1.2em;
    font-weight: bold;
}

#new-row:hover {
    cursor: pointer;
    filter: brightness(.8);
}

.row {
    display: grid;
    grid-template-rows: repeat(1, 50px);
    background-color: white;
    height: 50px;
    margin: 0 auto;
}

.box {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 50px;
    width: 50px;
    border: 4px solid black;
    font-weight: bolder;
    font-size: 1.4em;
}